That's cold

Joe: There was an animal called a 'hare-mouse' that lived in ice lion times. ['Ice lion times' roughly correspond to the Miocene Period.]
Dad: Uh-huh.
Joe: It's very sad, there aren't many left in modern times, because people hunted them and killed most of them, for their fur.
Dad: People hunted mice for their fur?
Joe: It was thick fur.